Research On Optimization Of Work Division Of High-speed Railway Hub Stations Considering The Use Of Stock And The Overhaul Of Emus

With the rapid growth of my country’s high-speed railway network and the continuous increase in operating mileage,my country has built many high-speed railway hubs with multiple high-speed railway lines such as Beijing,Shanghai,and Zhengzhou.The continuous and rapid growth of high-speed rail passenger flow in the hub and the rapid increase in the number of EMU trains have increased the pressure on the operation and organization of the hub,and the capacity of the hub has become increasingly tense.Studying the optimization of the work division of high-speed rail hub stations will help plan and coordinate the train organization and passenger transfer relationships among multiple high-speed rail stations in the hub,and can further explore and develop the capacity of the hub station equipment and relieve the pressure on the hub’s operation organization.After sorting out relevant domestic and foreign research,the research work carried out in this article is as follows:(1)The related content of the division of labor in high-speed rail hub stations is studied.Firstly,it defines the concept and research scope of the high-speed rail hub,and explains the equipment and technical operations of the high-speed rail hub.Put forward the principle and concept of the division of labor for the high-speed rail hub station layout,analyze and refine the factors affecting the division of labor for the high-speed rail hub station,summarize the station division mode,and provide a solid theoretical basis for subsequent research on the subject.(2)The division of labor for high-speed rail hub stations is studied,that is,under the actual road network and the determined high-speed rail station layout,according to the passenger flow demand and the operation needs of the EMUs in the hub,reasonable operation paths and operating sites are arranged for the trains in each direction.The multi-commodity flow and the optimization theory of train flow paths are cited,and the EMU trains in different directions are regarded as different commodity flows.The generation method of train operation candidate set of EMU considering the demand of passenger flow is proposed.On the basis of the point-arc model,constraints such as the receiving and dispatching capacity of the high-speed rail hub infield station,the difference of the stock road,the rationality of the operation node,and the use of the stored vehicles and the overhaul capacity of the high-speed rail hub are added.An optimization model for the division of labor at high-speed railway hub stations is constructed,which takes into account the use of strands and the maintenance of EMUs in the high-speed railway hub with the goal of minimizing the train operation cost of the high-speed railway hub.According to the model,a corresponding Lagrangian relaxation algorithm is designed,and a corresponding example is designed to verify the effectiveness of the model and algorithm.(3)The Zhengzhou high-speed rail hub is selected as a practical case.Based on the planned annual road network of the Zhengzhou high-speed rail hub and the handling of EMU train operations,the Zhengzhou high-speed rail hub station operation division is optimized.Based on the forecast data in the general plan of the hub,the Lagrangian relaxation algorithm is used to solve the optimized train path and operation station of the EMU,and the optimization plan for the division of labor at the high-speed railway hub station is analyzed and combed.Compare the optimization plan with the planning plan from a qualitative and quantitative perspective,analyze the improvement of the optimization plan,and provide a certain reference for the operation and decision-making of the hub.